Improvement in compositions for covering metallic surfaces



if UNITED STATES PATENT OFFICE JAMES rnneuson, or BRIDGEWATER, MASSACHUSETTS, ASSIGNOR TO BRIDGEWATER IRON COMPANY, or SAME PLACE.

IMPROVEMENT IN COMPOSITIONS FOR COVERING METALLIC SURFACES.

Specification forming part of Letters Patent No. 171,004, dated December 14, 1875; application filed November 16, 1875.

To all whom it may concern drical tubes. The composition effectually pre- Be it known that I, JAMES FERGUSON, of vents adhesion of the inner surfaces of the Bridgewater, in the county of Plymouth and blanks under the action of the great heat and State of Massachusetts, have invented a new the reducing-rollers. and useful composition to prevent metallic The graphite, being infusible, resists the acsurfaces from adhering or welding together tion of the heat. The chloride not only oper- 1 while subjected to heat and pressure; and I ates to keep the graphite in suspension in the do hereby declare the same to be described as solution, but to bind it to the metal, and prefollows: vent it from scaling therefrom or separating The said composition is composed of pulverwhile being extended therewithby the rollers. ized graphite and a solution of chloride of sodi- The graphite, to operate to the best advanum 5 the proportions of the ingredients which tage, generally should, on being applied to I have found to answer well in practice being the solution of the chloride, be in the state of one gallon of water, one-halfapound of chloride an impalpable powder. of sodium, and one-quarter of a pound of I do not confine my invention to the precise graphite. After the graphite and the chloride proportions of the ingredients as above dehave been put into the water thewhole should scribed, as such may be varied somewhat be thoroughly stirred, which having been acwithout materially aii'ecting the efficiency of complished, so as to cause the water to disthe compound. solve the chloride, the mixture will be com- I claimplete. To use it, it is to be painted or spread For preventing the adhering of heated mewith a brush over the surfaces to be protallic surfaces, the composition consisting of tected. graphite, chloride of sodium, and water, sub- The particular application I have made of stantially as above described. it in the arts is to the bores of tubular metallic JAMES FERGUSON. ingots, such as, by means of rollers, are drawn Witnesses: in a heated state into fiat blanks, to be subse- B. H. EDDX, quently spread open into the forms of cylin- J. R. SNOW. 

